I'm pretty much a stickler in setting up of ukuleles, same for basses and guitars. Let's face it when someone, me, cuts a saddle into four peices, one for each string, to get each one compensated just right there may be a little too much attention to detail.
When I played bass at our church a number of years ago I had Korg tuner with the leds and got pretty good at judging the speed and and brightness to find that correct in tune range of the green color. But you are right, having a tuner that just gives you a center line and turns green in color doesn't mean you are really in tune.
For my ukuleles, I have using Intelli IMT 500 and 600 clip-ons with an "analog looking" dial and they seem to work pretty good. Although I have never owned one, there are tons on reviews over the years on the accuracy of Peterson strobe tuners. BTW... there is supposed to be an iTouch/iPhone app for around $10, that is supposed to be really good too.
But... when it comes to intonation and a ukulele, there are so many factors... string diameter and tension will slightly throw intonation off, action, the biggest one is the inability to press down low tension strings so perfectly to maintain intonation. And there even those who mathematically calculate that the use of straight across frets is a compromise to perfect intonation on any stringed instrument. I imagine it would be possible for someone to compensate the crown each fret for each string to get each note as close perfect.
That said, if I had $70 lying around, I would be the type that would probably buy it for set-ups. Unfortuantely that would force me to spend countless more hours tweaking to get everything just right.
Usually after thinking about all of this, I just go and play and not worry about it and it makes me feel so much better.
John